ADD TIMETABLE FOR CHRISTMAN?
This is Christman's secret lair in the Frassberg region. He has lived here for decades and made the cave system his home. There are three "factions" active in the dungeon:
Christman Grippertenius. Spends most of his days drinking himself into a stupor. Will either kill or capture any intruders. Prisoners will be tortured and eventually killed. He treats Lise Mueller as a scullery maid and otherwise ignores her. He is afraid of the ghost of Getrude Kaasman. If he thinks a part of the cave system is currently being haunted by the ghost, he will move as far away as possible.
Lise (Lischen) Mueller. A satanic witch. She let herself be captured by Christman and is his current "wife". Christman is known for haven taken many "wives" (i.e., abducted women and kept them in his dungeon against their will) over the years. In his old age, he has done so less frequently and mostly does it out of habit and for having someone around to help him clean. Lise is a cunning witch that has out herself into Christman's hands in order to conceive a child with him. Because Christman has no interest in her (or anyone for that matter) and is mostly drunk, she is scheming to spoil is alcohol supply, cut off future deliveries, and otherwise get him to pay attention to her. She is not beyond considering murdering Christman to get what she needs from his corpse. She has cast Charm on Christman, but his black soul has weakened the effects of the spell. Deep down, Christman fears Lise and tries to find excuses to be away from her.
The ghost of Gertrude Kaasmann. One of Christman's prior "wives". He murdered her and her child 23 years ago. She is a mere echo of a mother's grief and a general menace to any living creature. If she can be made to remember what happened to her, she can become an, albeit temporary, ally against Christman.
There are otherwise few creatures about in the dungeon. Christman's lair is a murderhole which he stalks like a predator. Try to play up the atmosphere of discovering serial killer's home (e.g., think Jame Gumb's basement in the movie Silence of the Lambs).
Christman has accumulated a huge amount of treasure over the years. Anyone brave enough to enter the caves and survive, might lay claim to unimaginable riches.
Due to Christman's familiarity with the dungeon, the base chance of Surprise increases from 2-6 to 4-6 for PCs. If Christman retreats from a fight, he has a 2-6 chance of simply vanishing when he runs into another room and PCs lose line of sight. This is not a supernatural ability and if PCs have extraordinary means of keeping track of Christman, this ability is countered.